Java中的孤立岛问题

After an object has been used, it is deallocated from the memory using the Garbage Collector class. The objects are destroyed based on the fact that no reference to that object is present. The Garbage Collector class calls the ‘finalize’ function on the object that needs to be destroyed.

What is island of isolation?

When two objects ‘a’, and ‘b’ reference each other, and they are not referenced by any other object, it is known as island of isolation.

It is a group of objects which reference each other but they are not referenced but other objects of other applications at all.

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Note − A single unreferenced object is also an island of isolation.

Let us see an example −

Example

 Live Demo

public class Demo{
   Demo i;
   public static void main(String[] args){
      Demo my_ob_1 = new Demo();
      System.out.println("Demo object one has been created");
      Demo my_ob_2 = new Demo();
      System.out.println("Demo object two has been created");
      my_ob_1.i = my_ob_2;
      my_ob_2.i = my_ob_1;
      my_ob_1 = null;
      my_ob_2 = null;
      System.gc();
   }
   @Override
   protected void finalize() throws Throwable{
      System.out.println("The finalize method has been called on the object");
   }
}

Output

Demo object one has been created
Demo object two has been created
The finalize method has been called on the object
The finalize method has been called on the object

一个名为Demo的类包含了主函数。在这里，创建了一个类型为Demo类的变量。创建了Demo类的一个实例，并将第二个对象分配给第一个对象的Demo对象。同样的方式也适用于第二个对象。现在，这两个对象都被分配为null，并调用了'System.gc'函数。现在，'finalize'函数被重写。